[3408] | 1 | /* Boost interval/detail/bcc_rounding_control.hpp file |
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| 2 | * |
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| 3 | * Copyright 2000 Jens Maurer |
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| 4 | * Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion |
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| 5 | * |
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| 6 | * Distributed under the Boost Software License, Version 1.0. |
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| 7 | * (See accompanying file LICENSE_1_0.txt or |
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| 8 | * copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 9 | */ |
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| 10 | |
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| 11 | #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_BCC_ROUNDING_CONTROL_HPP |
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| 12 | #define BOOST_NUMERIC_INTERVAL_DETAIL_BCC_ROUNDING_CONTROL_HPP |
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| 13 | |
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| 14 | #ifndef __BORLANDC__ |
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| 15 | # error This header is only intended for Borland C++. |
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| 16 | #endif |
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| 17 | |
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| 18 | #ifndef _M_IX86 |
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| 19 | # error This header only works on x86 CPUs. |
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| 20 | #endif |
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| 21 | |
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| 22 | #include <float.h> // Borland C++ rounding control |
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| 23 | |
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| 24 | namespace boost { |
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| 25 | namespace numeric { |
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| 26 | namespace interval_lib { |
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| 27 | namespace detail { |
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| 28 | |
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| 29 | #ifndef BOOST_NUMERIC_INTERVAL_KEEP_EXCEPTIONS_FOR_BCC |
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| 30 | extern "C" { unsigned int _RTLENTRY _fm_init(void); } |
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| 31 | |
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| 32 | struct borland_workaround { |
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| 33 | borland_workaround() { _fm_init(); } |
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| 34 | }; |
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| 35 | |
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| 36 | static borland_workaround borland_workaround_exec; |
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| 37 | #endif // BOOST_NUMERIC_INTERVAL_KEEP_EXCEPTIONS_FOR_BCC |
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| 38 | |
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| 39 | __inline double rint(double) |
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| 40 | { __emit__(0xD9); __emit__(0xFC); /* asm FRNDINT */ } |
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| 41 | |
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| 42 | struct x86_rounding |
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| 43 | { |
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| 44 | typedef unsigned int rounding_mode; |
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| 45 | static void get_rounding_mode(rounding_mode& mode) |
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| 46 | { mode = _control87(0, 0); } |
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| 47 | static void set_rounding_mode(const rounding_mode mode) |
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| 48 | { _control87(mode, 0xffff); } |
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| 49 | static double to_int(const double& x) { return rint(x); } |
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| 50 | }; |
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| 51 | |
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| 52 | } // namespace detail |
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| 53 | } // namespace interval_lib |
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| 54 | } // namespace numeric |
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| 55 | } // namespace boost |
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| 56 | |
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| 57 | #endif /* BOOST_NUMERIC_INTERVAL_DETAIL_BCC_ROUNDING_CONTROL_HPP */ |
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